根据括号内的汉语提示,写单词完成句子。

1. She _____( 寄) a postcard to her mother yesterday.

2. Here is a map of ______( 欧洲).

3. I often swam in the ______( 湖) near my house when I was young.

4. My grandpa lives in the ______( 农村).

5. Jerry couldn't stand city life and went back to _______( 大自然).

局域网参考模型将对应于OSI参考模型的数据链路层划分为MAC子层与( )。

A．LLC子层

B．PMD子层

C．接入子层

D．汇聚子层